title: Preparation of activated carbon hollow fibers from ramie at low temperature for electric double-layer capacitor applications.
abstract: Activated carbon hollow fibers (ACHFs) with high surface area were prepared from inexpensive, renewable ramie fibers (RFs) by a single-step activation method under lower temperature than that of other reports. The effects of activation conditions on the pore structure and turbostratic structure of ACHFs were investigated systematically. The results show that ACHFs surface area decreased but micropore volume and conductivity increased as the increase of activation temperature and activation time. The electrochemical measurements of supercapacitors fabricated from these ACHFs electrodes reveal that the electrochemical properties improved with the enhancing of activation degree. However, too high activation temperature can make the ion diffusion resistance increase. It suggests that pore structure and conductivity are as important as surface area to decide the electrochemical performances of ACHFs electrode materials. A maximum capacity of 287 F g(-1) at 50 mA g(-1) was obtained for the ACHFs electrode prepared under suitable conditions.
authors.affiliation: National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Du
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Chengyang
authors.initials: C
authors.lastname: Wang
authors.forename: Mingming
authors.initials: M
authors.lastname: Chen
authors.forename: Tao
authors.initials: T
authors.lastname: Qi
authors.forename: Chao
authors.initials: C
authors.lastname: Hua
authors.forename: Mingguo
authors.initials: M
authors.lastname: Ma
mesh_terms: D000327:Adsorption; D032402:Boehmeria / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D025802:Electric Capacitance; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D009584:Nitrogen / Q000737:chemistry; D016062:Porosity; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D002606:Charcoal; D009584:Nitrogen
keywords: Activated carbon hollow fiber; Conductivity; Electric double-layer capacitor; Pore structure; Ramie fiber